Polyvinyl alcohol (PVA) yog ib qhov polymer uas siv ntau vim nws zoo li tshuav huv nrog dej thiab siv ntau yam. Nws raug siv nyob rau hauv qhov chaw tsim vaj tsev raws ib qhov khoom tso caij kom muaj zog rau cov kab ntsug thaum tshuag. PVA kuj yog ib qhov cuab yeej tseem ceeb nyob rau hauv qhov chaw tsim daim ntawv, qhov twg nws txhim kho qhov zog thiab kev pheej xwm ntawm dej ntawm cov khoom ntawv. Qhov tshuaj txaus siab ntawm nws tau siv nyob rau hauv cov khoom lag luam uas tuaj yeem phom los, ua rau nws yog ib qhov kev lees paj lug zoo dua rau cov roj hmwe plastik tas li.